If a person borrows $2900,00 and, after 9 months, pays off the loan in the amount of $3008.75, what per annum rate of interest was charged? % (Round to the nearest tenth as needed.)

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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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### Loan Repayment and Interest Calculation

#### Problem Statement:
If a person borrows $2900.00 and, after 9 months, pays off the loan in the amount of $3008.75, what per annum rate of interest was charged? 

\[  \boxed{} \]

\(\% \text{ (Round to the nearest tenth as needed.)}\)

#### Options:
- [ ] View an example 
- [ ] Textbook

---

This problem requires you to determine the annual interest rate charged on a loan. The principal amount borrowed is $2900.00, and the total amount paid after 9 months is $3008.75. Use the simple interest formula to find the annual interest rate.

The simple interest formula is:

\[ I = P \times r \times t \]

Where:
- \( I \) is the interest
- \( P \) is the principal amount
- \( r \) is the annual interest rate (as a decimal)
- \( t \) is the time the money is borrowed for, in years

You need to rearrange the formula to solve for \( r \):

\[ r = \frac{I}{P \times t} \]

First, calculate the interest (\( I \)):

\[ I = \text{Total Amount Paid} - \text{Principal} \]
\[ I = 3008.75 - 2900.00 \]
\[ I = 108.75 \]

Since the loan is paid off after 9 months, convert this time period to years:

\[ t = \frac{9}{12} = 0.75 \text{ years} \]

Now, substitute the known values into the rearranged formula:

\[ r = \frac{108.75}{2900 \times 0.75} \]

Finally, convert the rate from a decimal to a percentage by multiplying by 100 and round to the nearest tenth:

\[ r (\%) = r \times 100 \]

Make sure to follow these steps to find the correct annual interest rate.
Transcribed Image Text:--- ### Loan Repayment and Interest Calculation #### Problem Statement: If a person borrows $2900.00 and, after 9 months, pays off the loan in the amount of $3008.75, what per annum rate of interest was charged? \[ \boxed{} \] \(\% \text{ (Round to the nearest tenth as needed.)}\) #### Options: - [ ] View an example - [ ] Textbook --- This problem requires you to determine the annual interest rate charged on a loan. The principal amount borrowed is $2900.00, and the total amount paid after 9 months is $3008.75. Use the simple interest formula to find the annual interest rate. The simple interest formula is: \[ I = P \times r \times t \] Where: - \( I \) is the interest - \( P \) is the principal amount - \( r \) is the annual interest rate (as a decimal) - \( t \) is the time the money is borrowed for, in years You need to rearrange the formula to solve for \( r \): \[ r = \frac{I}{P \times t} \] First, calculate the interest (\( I \)): \[ I = \text{Total Amount Paid} - \text{Principal} \] \[ I = 3008.75 - 2900.00 \] \[ I = 108.75 \] Since the loan is paid off after 9 months, convert this time period to years: \[ t = \frac{9}{12} = 0.75 \text{ years} \] Now, substitute the known values into the rearranged formula: \[ r = \frac{108.75}{2900 \times 0.75} \] Finally, convert the rate from a decimal to a percentage by multiplying by 100 and round to the nearest tenth: \[ r (\%) = r \times 100 \] Make sure to follow these steps to find the correct annual interest rate.
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